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io_uring: allow updating linked timeouts 

We allow updating normal timeouts, add support for adjusting timings of
linked timeouts as well.

Reported-by: Victor Stewart <v@nametag.social>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-08-28 19:54:39 -06:00 committed by Jens Axboe
parent ef9dd63708
commit f1042b6ccb
2 changed files with 46 additions and 9 deletions
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44
fs/io_uring.c
View File

@ -552,6 +552,7 @@ struct io_timeout_rem {
/* timeout update */
struct timespec64 ts;
u32 flags;
bool ltimeout;
};
struct io_rw {
@ -1069,6 +1070,7 @@ static int io_req_prep_async(struct io_kiocb *req);
static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
unsigned int issue_flags, u32 slot_index);
static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer);
static struct kmem_cache *req_cachep;
@ -5732,6 +5734,31 @@ static clockid_t io_timeout_get_clock(struct io_timeout_data *data)
}
}
static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
struct timespec64 *ts, enum hrtimer_mode mode)
__must_hold(&ctx->timeout_lock)
{
struct io_timeout_data *io;
struct io_kiocb *req;
bool found = false;
list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) {
found = user_data == req->user_data;
if (found)
break;
}
if (!found)
return -ENOENT;
io = req->async_data;
if (hrtimer_try_to_cancel(&io->timer) == -1)
return -EALREADY;
hrtimer_init(&io->timer, io_timeout_get_clock(io), mode);
io->timer.function = io_link_timeout_fn;
hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode);
return 0;
}
static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data,
struct timespec64 *ts, enum hrtimer_mode mode)
__must_hold(&ctx->timeout_lock)
@ -5763,10 +5790,15 @@ static int io_timeout_remove_prep(struct io_kiocb *req,
if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in)
return -EINVAL;
tr->ltimeout = false;
tr->addr = READ_ONCE(sqe->addr);
tr->flags = READ_ONCE(sqe->timeout_flags);
if (tr->flags & IORING_TIMEOUT_UPDATE) {
if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS))
if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) {
if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1)
return -EINVAL;
if (tr->flags & IORING_LINK_TIMEOUT_UPDATE)
tr->ltimeout = true;
if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS))
return -EINVAL;
if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2)))
return -EFAULT;
@ -5800,9 +5832,13 @@ static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags)
spin_unlock_irq(&ctx->timeout_lock);
spin_unlock(&ctx->completion_lock);
} else {
enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags);
spin_lock_irq(&ctx->timeout_lock);
ret = io_timeout_update(ctx, tr->addr, &tr->ts,
io_translate_timeout_mode(tr->flags));
if (tr->ltimeout)
ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode);
else
ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode);
spin_unlock_irq(&ctx->timeout_lock);
}

11
include/uapi/linux/io_uring.h
View File

@ -149,12 +149,13 @@ enum {
/*
* sqe->timeout_flags
*/
#define IORING_TIMEOUT_ABS (1U << 0)
#define IORING_TIMEOUT_UPDATE (1U << 1)
#define IORING_TIMEOUT_BOOTTIME (1U << 2)
#define IORING_TIMEOUT_REALTIME (1U << 3)
#define IORING_TIMEOUT_ABS (1U << 0)
#define IORING_TIMEOUT_UPDATE (1U << 1)
#define IORING_TIMEOUT_BOOTTIME (1U << 2)
#define IORING_TIMEOUT_REALTIME (1U << 3)
#define IORING_LINK_TIMEOUT_UPDATE (1U << 4)
#define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME)
#define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE)
/*
* sqe->splice_flags
* extends splice(2) flags